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Re: Clarify what it does

by dsheroh (Prior)
on May 31, 2012 at 13:35 UTC ( #973522=note: print w/replies, xml ) Need Help??


in reply to Clarify what it does
in thread What operator should perl5porters use for safe dereferencing?

It would make $bar-XX>method() safe if $bar is undefined, but what if $bar is a scalar? Or an unblessed reference? Or an array ref? or a coderef?
The poll question specifically states it's for attempting to call methods on undef. I'm fairly certain that it's not intended to gloss over attempts to call methods on arbitrary scalars and especially not on references of the incorrect type. Those should definitely remain errors.
Would the same operator work for fetching elements of array refs and or keys of hashrefs, or only for methods?
Interesting thought... It would make sense to me, at least, that if an arrayref/hashref is undef, then all of its elements are implicitly undef as well.

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[MidLifeXis]: I think I forgot "running on a farm of commodore 64, vic 20s, trs 80s, and apple ]|[e systems"
[GotToBTru]: oh I know what it is .. but it is a number only slightly useful to me and of no possible use to our customer
[MidLifeXis]: Whew - you just saved the free world. <o)
[GotToBTru]: i guess it's a placeholder, the code will only fill it in if there is nothing else to use
[GotToBTru]: but then .. if you have nothing to say, why not say nothing?
[MidLifeXis]: I have a user who has a lot of say on how some of our processes work that abhors significant blanks. Perhaps that is a part of it. A not-so-obvious "this space intentionally left blank" indicator.
[MidLifeXis]: On the back end, however, that doesn't mean that i have to use that value to indicate "undefined", no matter how much he thinks I should.

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